1 /* 2 * Copyright (C) ST-Ericsson SA 2010 3 * 4 * License Terms: GNU General Public License v2 5 * Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson 6 * Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson 7 * 8 * UX500 common part of Power domain regulators 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/err.h> 13 #include <linux/regulator/driver.h> 14 #include <linux/debugfs.h> 15 #include <linux/seq_file.h> 16 #include <linux/slab.h> 17 #include <linux/module.h> 18 19 #include "dbx500-prcmu.h" 20 21 /* 22 * power state reference count 23 */ 24 static int power_state_active_cnt; /* will initialize to zero */ 25 static DEFINE_SPINLOCK(power_state_active_lock); 26 27 void power_state_active_enable(void) 28 { 29 unsigned long flags; 30 31 spin_lock_irqsave(&power_state_active_lock, flags); 32 power_state_active_cnt++; 33 spin_unlock_irqrestore(&power_state_active_lock, flags); 34 } 35 36 int power_state_active_disable(void) 37 { 38 int ret = 0; 39 unsigned long flags; 40 41 spin_lock_irqsave(&power_state_active_lock, flags); 42 if (power_state_active_cnt <= 0) { 43 pr_err("power state: unbalanced enable/disable calls\n"); 44 ret = -EINVAL; 45 goto out; 46 } 47 48 power_state_active_cnt--; 49 out: 50 spin_unlock_irqrestore(&power_state_active_lock, flags); 51 return ret; 52 } 53 54 #ifdef CONFIG_REGULATOR_DEBUG 55 56 static int power_state_active_get(void) 57 { 58 unsigned long flags; 59 int cnt; 60 61 spin_lock_irqsave(&power_state_active_lock, flags); 62 cnt = power_state_active_cnt; 63 spin_unlock_irqrestore(&power_state_active_lock, flags); 64 65 return cnt; 66 } 67 68 static struct ux500_regulator_debug { 69 struct dentry *dir; 70 struct dentry *status_file; 71 struct dentry *power_state_cnt_file; 72 struct dbx500_regulator_info *regulator_array; 73 int num_regulators; 74 u8 *state_before_suspend; 75 u8 *state_after_suspend; 76 } rdebug; 77 78 void ux500_regulator_suspend_debug(void) 79 { 80 int i; 81 82 for (i = 0; i < rdebug.num_regulators; i++) 83 rdebug.state_before_suspend[i] = 84 rdebug.regulator_array[i].is_enabled; 85 } 86 87 void ux500_regulator_resume_debug(void) 88 { 89 int i; 90 91 for (i = 0; i < rdebug.num_regulators; i++) 92 rdebug.state_after_suspend[i] = 93 rdebug.regulator_array[i].is_enabled; 94 } 95 96 static int ux500_regulator_power_state_cnt_print(struct seq_file *s, void *p) 97 { 98 /* print power state count */ 99 seq_printf(s, "ux500-regulator power state count: %i\n", 100 power_state_active_get()); 101 102 return 0; 103 } 104 105 static int ux500_regulator_power_state_cnt_open(struct inode *inode, 106 struct file *file) 107 { 108 return single_open(file, ux500_regulator_power_state_cnt_print, 109 inode->i_private); 110 } 111 112 static const struct file_operations ux500_regulator_power_state_cnt_fops = { 113 .open = ux500_regulator_power_state_cnt_open, 114 .read = seq_read, 115 .llseek = seq_lseek, 116 .release = single_release, 117 .owner = THIS_MODULE, 118 }; 119 120 static int ux500_regulator_status_print(struct seq_file *s, void *p) 121 { 122 int i; 123 124 /* print dump header */ 125 seq_puts(s, "ux500-regulator status:\n"); 126 seq_printf(s, "%31s : %8s : %8s\n", "current", "before", "after"); 127 128 for (i = 0; i < rdebug.num_regulators; i++) { 129 struct dbx500_regulator_info *info; 130 /* Access per-regulator data */ 131 info = &rdebug.regulator_array[i]; 132 133 /* print status */ 134 seq_printf(s, "%20s : %8s : %8s : %8s\n", 135 info->desc.name, 136 info->is_enabled ? "enabled" : "disabled", 137 rdebug.state_before_suspend[i] ? "enabled" : "disabled", 138 rdebug.state_after_suspend[i] ? "enabled" : "disabled"); 139 } 140 141 return 0; 142 } 143 144 static int ux500_regulator_status_open(struct inode *inode, struct file *file) 145 { 146 return single_open(file, ux500_regulator_status_print, 147 inode->i_private); 148 } 149 150 static const struct file_operations ux500_regulator_status_fops = { 151 .open = ux500_regulator_status_open, 152 .read = seq_read, 153 .llseek = seq_lseek, 154 .release = single_release, 155 .owner = THIS_MODULE, 156 }; 157 158 int __attribute__((weak)) dbx500_regulator_testcase( 159 struct dbx500_regulator_info *regulator_info, 160 int num_regulators) 161 { 162 return 0; 163 } 164 165 int 166 ux500_regulator_debug_init(struct platform_device *pdev, 167 struct dbx500_regulator_info *regulator_info, 168 int num_regulators) 169 { 170 /* create directory */ 171 rdebug.dir = debugfs_create_dir("ux500-regulator", NULL); 172 if (!rdebug.dir) 173 goto exit_no_debugfs; 174 175 /* create "status" file */ 176 rdebug.status_file = debugfs_create_file("status", 177 S_IRUGO, rdebug.dir, &pdev->dev, 178 &ux500_regulator_status_fops); 179 if (!rdebug.status_file) 180 goto exit_destroy_dir; 181 182 /* create "power-state-count" file */ 183 rdebug.power_state_cnt_file = debugfs_create_file("power-state-count", 184 S_IRUGO, rdebug.dir, &pdev->dev, 185 &ux500_regulator_power_state_cnt_fops); 186 if (!rdebug.power_state_cnt_file) 187 goto exit_destroy_status; 188 189 rdebug.regulator_array = regulator_info; 190 rdebug.num_regulators = num_regulators; 191 192 rdebug.state_before_suspend = kzalloc(num_regulators, GFP_KERNEL); 193 if (!rdebug.state_before_suspend) 194 goto exit_destroy_power_state; 195 196 rdebug.state_after_suspend = kzalloc(num_regulators, GFP_KERNEL); 197 if (!rdebug.state_after_suspend) 198 goto exit_free; 199 200 dbx500_regulator_testcase(regulator_info, num_regulators); 201 return 0; 202 203 exit_free: 204 kfree(rdebug.state_before_suspend); 205 exit_destroy_power_state: 206 debugfs_remove(rdebug.power_state_cnt_file); 207 exit_destroy_status: 208 debugfs_remove(rdebug.status_file); 209 exit_destroy_dir: 210 debugfs_remove(rdebug.dir); 211 exit_no_debugfs: 212 dev_err(&pdev->dev, "failed to create debugfs entries.\n"); 213 return -ENOMEM; 214 } 215 216 int ux500_regulator_debug_exit(void) 217 { 218 debugfs_remove_recursive(rdebug.dir); 219 kfree(rdebug.state_after_suspend); 220 kfree(rdebug.state_before_suspend); 221 222 return 0; 223 } 224 #endif 225